Weather is probably a major factor when you plan your trip to Cano Island, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and February with an average temp of 81°F, while the coldest months are January and February with an average of 80°F. The rainiest months in Cano Island are October, July, August, and November, with each month seeing an average of 27 inches of rainfall.